fix typo
added  use_plugin_path() function to simplify calling sys.path.insert(0, plugin_path())
updated lineshapes definitions, doc
updatad doc
more doc changes
more doc changes
added physical_constants.py to hold standard constants (hbar, etc)
removed unused import
remove unused import
improve closure wrapping
add tests for number of args to closure (all larch functions)
small change needed for reading older XRF map folders
add contrib folder for user-contributed plugins, pulled larch_plugins from maurov
added specfile.py from maurov rovezzi, needs PyMCA to work...
add (unfinished) hook from MapViewer to XRF Display
add (unfinished) hook from MapViewer to XRF Display
tweaked specfile plugin for fewer messages if PyMca is not available
tweaked specfile plugin for fewer messages if PyMca is not available
specfile plugin now silent (but routinese not avalibe) if PyMca is missing
added chunksize option for h5 files, set decent defaults

optimized for writing...