Allow makefile to autogen gitignore in tango icon dir
Drop some unichar_t variant of widgets which are not used for >8yr, according to git blame and function caller graph
Allocate string dynamically instead of relying on char array in dialogs
Rework histogram dialog to use utf8 strings instead of unichar_t
u_sprintf() and friends now begone
Merge pull request #1168 from abelcheung/old-cruft-slimming

Old cruft slimming