* fix for autosave location -> shouldn't use BLI_gethome anymore
* this frees BLI_gethome of having to emulate the local->user->system search path and can now be truly considered as 'home/default location for .blend files'
* removed setting the default G.sce from read_history, was out of context there.
* fix for creating user dir, leftover from previous commit.
jesterKing, please review -> if there are any issues I will fix or revert.