v0.7.0

*Added 'copy to clipboard' feature: now content of a range can be copied to clipboard using the :ccopy command.
*Added 'paste from clipboard' feature with :cpaste command.
*Added :subtotal
*Added autobackup feature
*Added :plot command with the following types of chart: line, scatter, bar and pie.
*Added :plotedit command
*New "version" argument. --version can be passed to scim executable file as argv. This will show Sc-im version number
and the different features enabled at compile time.
*Change when moving in command mode and insert mode history:
if inputline is not empty, up and down keys now recall older commands from history,
but taking whose commands that beginning matches the current inputline content.
*Changed default options for numeric, newline_action, numeric_decimal, numeric_zero.
*Doxygen support
*exit_app: only free histories if in ncurses ui. this fix a segfault when quitting.
*replaced :i command. Now xlsx, xls, csv, tsv and tab files shall be imported with the :load command.
*Ignore case when handing special keys in a map
*Handle mappings with double quotes
*Handle SIGTSTP and SIGCONT signals. #213
*fix in csv import: little fix when importing csv files that had commas between quotes. sc-im used to ignore those comma during import process.
*fix in auto numeric when using insert mode history.
*Fix when saving cellcolors. #187
*fix in nmap. #178
*fix in sorting when no range is selected. #180
*fix when displaying help page. #188
*fix in @slen with wide chars. #196
*fix when resizing terminal. #199
*fix calculation when using @pi. #209
*fix when numeric=0 and try to use 0 command. #212
*fix : not initialize colors if working in interactive mode. #220
*fix when :color is intended to be used without having set enough parameters. #219
*fix when editing cells with string expressions. #197