added some general purpose file utility plugins
Merge branch 'master' of github.com:xraypy/xraylarch
code cleanups, remove as much explicit size setting as possible
add read_xmap_netcdf() for reading netcdf file from XIA xMAP file
added several files in plugins/xrfmap/ for reading GSE XRF Maps
add XRF Pileup modeling example
reorg xrfmap