netdata doubles (#13217)

* netdata doubles

* fix cmocka test

* fix cmocka test again

* fix left-overs of long double to NETDATA_DOUBLE

* RRDDIM detached from disk representation; db settings in [db] section of netdata.conf

* update the memory before saving

* rrdset is now detached from file structures too

* on memory mode map, update the memory mapped structures on every iteration

* allow RRD_ID_LENGTH_MAX to be changed

* granularity secs, back to update every

* fix formatting

* more formatting

114 files changed, 1787 insertions, 1503 deletions

diff --git a/aclk/aclk_rx_msgs.c b/aclk/aclk_rx_msgs.c
index 65e4955b82..a47918706b 100644
--- a/aclk/aclk_rx_msgs.c
+++ b/aclk/aclk_rx_msgs.c
@@ -55,19 +55,19 @@ static int cloud_to_agent_parse(JSON_ENTRY *e)
             break;
         case JSON_NUMBER:
             if (!strcmp(e->name, "version")) {
-                data->version = e->data.number;
+                data->version = (int)e->data.number;
                 break;
             }
             if (!strcmp(e->name, "timeout")) {
-                data->timeout = e->data.number;
+                data->timeout = (int)e->data.number;
                 break;
             }
             if (!strcmp(e->name, "min-version")) {
-                data->min_version = e->data.number;
+                data->min_version = (int)e->data.number;
                 break;
             }
             if (!strcmp(e->name, "max-version")) {
-                data->max_version = e->data.number;
+                data->max_version = (int)e->data.number;
                 break;
             }
 
diff --git a/cli/README.md b/cli/README.md
index 75a90b08a2..afd5651cb6 100644
--- a/cli/README.md
+++ b/cli/README.md
@@ -20,7 +20,7 @@ reload-health
 reload-labels
     Reload all labels.
 save-database
-    Save internal DB to disk for memory mode save.
+    Save internal DB to disk for database mode save.
 reopen-logs
     Close and reopen log files.
 shutdown-agent
diff --git a/collectors/apps.plugin/apps_plugin.c b/collectors/apps.plugin/apps_plugin.c
index 8a115d0612..8521e078e8 100644
--- a/collectors/apps.plugin/apps_plugin.c
+++ b/collectors/apps.plugin/apps_plugin.c
@@ -173,7 +173,8 @@ static kernel_uint_t
         global_gtime = 0;
 
 // the normalization ratios, as calculated by normalize_utilization()
-double  utime_fix_ratio = 1.0,
+NETDATA_DOUBLE
+        utime_fix_ratio = 1.0,
         stime_fix_ratio = 1.0,
         gtime_fix_ratio = 1.0,
         minflt_fix_ratio = 1.0,
@@ -501,7 +502,8 @@ struct file_descriptor {
 static int
         all_files_len = 0,
         all_files_size = 0;
-        long double currentmaxfds = 0;
+
+long currentmaxfds = 0;
 
 // ----------------------------------------------------------------------------
 // read users and groups from files
@@ -3021,7 +3023,7 @@ static inline void aggregate_pid_fds_on_targets(struct pid_stat *p) {
     reallocate_target_fds(u);
     reallocate_target_fds(g);
 
-    long double currentfds = 0;
+    long currentfds = 0;
     size_t c, size = p->fds_size;
     struct pid_fd *fds = p->fds;
     for(c = 0; c < size ;c++) {
@@ -3373,7 +3375,7 @@ static void normalize_utilization(struct target *root) {
             gtime_fix_ratio  =
             cutime_fix_ratio =
             cstime_fix_ratio =
-            cgtime_fix_ratio = 1.0; //(double)(global_utime + global_stime) / (double)(utime + cutime + stime + cstime);
+            cgtime_fix_ratio = 1.0; //(NETDATA_DOUBLE)(global_utime + global_stime) / (NETDATA_DOUBLE)(utime + cutime + stime + cstime);
         }
         else if((global_utime + global_stime > utime + stime) && (cutime || cstime)) {
             // children resources are too high
@@ -3383,7 +3385,7 @@ static void normalize_utilization(struct target *root) {
             gtime_fix_ratio  = 1.0;
             cutime_fix_ratio =
             cstime_fix_ratio =
-            cgtime_fix_ratio = (double)((global_utime + global_stime) - (utime + stime)) / (double)(cutime + cstime);
+            cgtime_fix_ratio = (NETDATA_DOUBLE)((global_utime + global_stime) - (utime + stime)) / (NETDATA_DOUBLE)(cutime + cstime);
         }
         else if(utime || stime) {
             // even running processes are unrealistic
@@ -3391,7 +3393,7 @@ static void normalize_utilization(struct target *root) {
             // lower the running processes resources
             utime_fix_ratio  =
             stime_fix_ratio  =
-            gtime_fix_ratio  = (double)(global_utime + global_stime) / (double)(utime + stime);
+            gtime_fix_ratio  = (NETDATA_DOUBLE)(global_utime + global_stime) / (NETDATA_DOUBLE)(utime + stime);
             cutime_fix_ratio =
             cstime_fix_ratio =
             cgtime_fix_ratio = 0.0;
@@ -3439,14 +3441,14 @@ static void normalize_utilization(struct target *root) {
 
     if(utime || stime || gtime)
         majflt_fix_ratio =
-        minflt_fix_ratio = (double)(utime * utime_fix_ratio + stime * stime_fix_ratio + gtime * gtime_fix_ratio) / (dou