Merging Branches into 3.15

Merge order already used once by ANJ:

lp:~anj/epics-base/reorg-src
This is a modified and possibly re-based version of lp:~mdavidsaver/epics-base/reorg-src
lp:~anj/epics-base/epicsEvent-api
lp:~anj/epics-base/process-get
lp:~ralph-lange/epics-base/server-side-plugins
I started to re-base this branch onto a test merge of the above branches, but I broke the tests in db/test in one of the re-base commits, so I didn't complete this merge and I need to start the re-base again (which is unfortunately not simple since there are conflicts with the variable-length-array-subscriptions code, amongst others).

Other branches to merge (may need reviewing first):

Anonymous