C++ flavored datacheck.sh & localupdate.sh for BSD

[yakra]

Closes#381.

Closes#380?

• Any discussion of how many threads to allow datacheck.sh can wait till we have a multi-threaded build on noreaster. Just using the single-threaded build for now.
• The new scripts are executable. @jteresco, I noticed the rest of the shell scripts are not. Feel free to chmod.
• Also search for TM repos in $HOME/TravelMapping/ and $HOME/tm/
• should git pull be part of datacheck.sh itself?

[jteresco]

I generally don't make the scripts executable since . is not in my search path anyway and it's just as easy to type sh localupdate.sh as ./localupdate.sh but I have no objection either way.

[yakra]

@jteresco, thoughts on including gmake in localupdate.sh & datacheck.sh?