[PATCH] additional documentation for Perl API

[[[
Add more documentation for some parts of the Perl API.
No changes to the actual code, except for some tidying of whitespace.
There are 'TODO' markers in some of this, but for the most part they
act as warnings of unexpected behaviour and unimplemented features, so
it's probably best to leave them in.
]]]

I've had this stuff sitting around for months waiting for me to
'finish' it, but that's not going to happen anytime soon. Still,
this might be useful.

SVN::Ra has got the most work since that's what I've been mostly using.

-- 
--- Geoff Richards -------------><-------------- http://ungwe.org/ ---
"I tried to fling my shadow at the moon,
 The while my blood leapt with a wordless song."  --  Theodore Roethke

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