Lock file, configurable renders directory, buffer moved to /tmp, RayPump's status updating when blender disconnects and small rsync optimizations

*Lock file is /tmp/raypump-<username>/raypump_lock
*The /tmp buffer is cleaned up at exit
*rsync sends only the current scene instead of syncronising the whole directory, added "--compress-level=9" to flags
Final changes to configurable renders directory

The full path for a job is saved and jobs can be opened after changing the directory
No more Unicode issues with directories :)
Error message when opening a nonexistent directory
Removed unused code and the dependency on sql
Fixed Mac Mavericks font issue and added button tooltips
Mavericks fix by user clavarreda:
http://raypump.com/forum/suggestion-box/11-paid-build-for-macintosh-os-x-mavericks#33
https://bugreports.qt-project.org/browse/QTBUG-32789
Workaround for a bug with autentication with rsync
Ask the Blender plug-in to wait if we haven't received our rsync pass yet
instead of having a send failure
customizable RENDERS directory - fixes for Windows