Add href icon
Remove iconsize.svgz

iconsize.png is just a helper bitmap to determine the icon size.
clean up SVGs with inkscape's --vacuum-defs and --export-plain-svg
Add Stéphane Mourey as contributor
Add LFUN_SERVER_GET_STATISTICS command

This function can be used with the LyX server to obtain the word, character or character+space count in the current document or selection.
Cmake build: No need to recreate lyx.pot on every make call.

We can check if imput data for 'gettext' command has changed from previous call.
If not, there is no need to recreate lyx.pot, which we only differ in
	"POT-Creation-Date: ...."