Add mouse support

- Direct selection of words by clicking.
- Tagging/untagging of words by clicking.
- Scrolling by clicks and wheel.
- Validation of the selection with a double-click.
- Shifting the content of the windows to the left or to the right,
  also added new keyboard keys < and > for that.

Three mouse tracking protocols are supported:
X11 (1000) and X11 SGR (1006) and urxvt (1015).

The X11 protocol limits lines and columns to 223 (e.g. screen < 4.7.0)
The other supported protocols don't have this limitation.

New options to disable the mouse, change the double-click delay and remap
the buttons of the mouse are available.

On (virtualised?) (Free)BSD it may be necessary to disable buttons
8 and 9, refer to the manual for details.

1 files changed, 6 insertions, 0 deletions

diff --git a/usage.c b/usage.c
index a770281..1d88d3f 100644
--- a/usage.c
+++ b/usage.c
@@ -98,6 +98,12 @@ common_help(void)
   printf("  overload the words number/max. word length/max columns limits.\n");
   printf("-f|-forgotten_timeout|-global_timeout\n");
   printf("  defines a global inactivity timeout, defaults to 15 min.\n");
+  printf("-nm|-no_mouse\n");
+  printf("  disable a possibly auto-detected mouse tracking support.\n");
+  printf("-br|-buttons|-button_remapping\n");
+  printf("  Remaps the left and right mouse buttons, default is 1 and 3.\n");
+  printf("-dc|-dcd|-double_click|-double_click_delay\n");
+  printf("  Change the mouse double-click delay which is 150 ms by default.\n");
 }
 
 void