Moved stringify macros to their own header file; updates places where they were
previously used.

Added call to #include definitions.h in CINT for rootbeer (edits to DragonRootbeer.cxx);
this also required Makefile updates to expose $PWD to the source as a macro.
Small changes to hist definitions file
DOxygen
Added construction  of midas::Event for rb scalers.
Added "no TS" option to mida::Event constructore.
Fixed bug in scaler unpacking.
got ride of cout from last commit's bug hunting
Added images for doxygen, updated doxygen documentation to add format describing section
Updated gitignore for .DS_Store files
Spelling correction
Fixed bug in TDC unpacking: MAX hits check was using <= where it should have
been >=.

Also, set up rootbeer unpackig to be singles only (ignoring timestamps, etc.)
This is temp. until the new clock firmware arrives.
Fixed bug in vme get_data() functions: used to be 16-bit return value,
which is too small for v1190 TDCs which have 19 bits of data. Changed to
int32_t return, so this should fix it.
Set MIDAS Buffer timeout to 10
Back to Channel as a subclass of V1190: