bin: added 'collapse' script

allows collapsing folder structures such as

your_dir/your_dir
to
your_dir
bin: added 'mergedir' script

allows merging one dir into an other
ignores dirname case
warns on overwrites
.gitconfig: added git log tree aliases
graphical: added xterm colors
local-nb: removed 'startx' function

reflects changes in my software setup
.sharedrc: added tons of usability aliases