file path saving in settings

Save pronterface changes into settings, fix not taking feedrate spinners into account

Fixes for breaking movements, update pronterface fields based on settings too

"set" command to store persistent variables for preferences

Added blurb for Fedora - tested on Fedora 15, x86_64

Specify install order in readme

Macro persistence

mousewheel zooming in gviz window

Read .pronsolerc from current directory if not found in home directory 

making macros work on pronterface

refactored reading pronsolerc as separate function, call that from pronterface

Added a short note in the README about another way to put python in 32bit mode for mac