bin/map: Set up Parallel Python with an env-var-customizable # CPUs

root Makefile: python-Linux: Added `sudo pip install pp`

root Makefile: python-Linux: Added python-parallel to installs

mappings: Build VegX-VegBIEN.organisms.csv from VegX-VegBIEN.stems.csv instead of vice versa. This entails switching the roots around so stem points to organism instead of the other way around, which is a complex operation. Re-rooted VegX-VegBIEN.organisms.csv at /plantobservation instead of /taxonoccurrence to avoid traveling up the hierarchy to taxonoccurrence and back down again to plantobservation, etc. as would otherwise have been the case.

bin/map: When determining if outer elements are types, look for /*s/ anywhere in the string instead of just at the beginning, because there might be root attrs (namespaces), etc. before it

bin/map: When determining if outer elements are types, look for /*s/ anywhere in the string instead of just at the beginning, because there might be root attrs (namespaces), etc. before it

xpath.py: get(): forward (parent-to-child) pointers: If last target object exists but doesn't have an ID attr (which indicates a bug), recover gracefully by just assuming the ID is 0. (Any bug will be noticeable in the output, which needs to be generated through workarounds like this in order to be able to debug.)

VegX mappings: Updated stemParent mapping for VegX 1.5.3

VegX mappings: Changed taxonDetermination of role identifier to instead have explicitly no role, because data providers' VegX files generally do not provide role information and we don't want the default taxonDetermination XPaths to require this

inputs/CTFS/maps/VegX.organisms.csv: Connected plot to plotObservation by using new support for backward (child-to-parent) pointers whose target is a text element containing an ID