Git-bash support for LV's Compare &  Merge tools

Quick instructions
From root level of repository, do:
	scr/setupLVTools.sh
Now, to diff VIs start with
	git difflv
To merge,
	git mergelv

scr/lvcompareWrapper.sh and scr/lvmergeWrapper.sh are wrapper scripts for
calling LVCompare.exe and LVMerge.exe (respectively) from the git-bash
shell using git aliases difflv and mergelv.  This provides an interface to
Labview's built-in Compare and Merge tools using typically git-bash
syntax.

scr/setupLVTools.sh installs these scripts in the standard directory
~/bin/, creating it if neccessary, and update the repository-local git
config parameters to enable the tools.