using message and error instead of prints
spelling out logical and testing class membership with inherits
using message instead of cat
fixed procona to ProCoNA in vignette
depending on MSnbase, so that the interface to MSnSet's in available on the search path
stop, not error and import BiocGenerics
typo pnet to net
message instead of cat
systematic message instead of cat
importing changes
pulled Dave's last changes and fixed conflicts
more message instead of cat and logical
updated vignette with MSnSet section
more small changes in MSnbase section
Merge branch 'master' of https://github.com/lgatto/ProCoNA