implement reading of rle encoded files
implement reading of hxzip types

* bring over relevant functions from AnalysisSuite
tests for new read.amiramesh hxzip/rle functionality
test for read.zlib
add additional equivalence test for hzip/rle data
test for 8 bit amiramesh data
fix reference to non-existent con variable
Add is.amiramesh and amiratype functions
read/write amira landmarks
Add @family amira to documented functions
fix typos after argument renames
document return type of read.amiralandmarks