Developer feedback on OTT 3.1 build process

[kcranston]

(Moving these from a comment on PR #335 )

Trying a build of ott3.1:

• docs need to note wget requirement (not installed by default on OS X)
• docs need a note about memory requirements (what are they?)
• is there a way to build just a subset of OTT (for testing, esp on a machine with low memory)
• use something more descriptive than single letter ‘r’ for the directory name
• possible to add config to use existing directories of OTT if already exist locally on users’ machine? (because the unpack-archive step quite long)
• several “** Missing version info for h2007 (OTT id 854455)” errors in make refresh/idlist step

[jar398]

• re 'r', this occurs so many times in the Makefile (200+), and has to be typed so often, that I wanted it to be short. And I can't think of a good name for it; it's not 'data' and I hate the word 'content'. I chose 'r' for 'resource' or 'resources' but that's not completely appropriate since it actually contains versions of resources.
• re using existing directories, one can do as you say using symbolic links, but it puzzles me that it's a problem for you - for me, the archives unpack once, and then I use the same unpacking for as many builds as I like. Are you doing make clean on each build? It's not really necessary. If so I wonder if I should exclude the source/ directories (unpackings) from the list of things to be deleted on make clean.

[blackrim]

Adding to this to identify taxa such as this so that they can be excluded from synth.