Spelling fixes.

Submitted by:	 Federico G. Schwindt

Thanks!
Adopt Lasses proposal to rename [be]req.request [be]req.method.

Keep .request as an alias for at least one release cycle.

I have gone a level deeper than Lasses patch, and also carried this
rename through the C-code, docs and VTC files.
Move the main table of parameters to its own source code before
starting surgery on parameter defaults.
Make it possible to truly change a parameters default value, rather
than hackishly just setting its value to the wanted default.

Fixes	#1244
Use the new param-default-setting ability, to simplify the magic
surrounding the privsep user/group setting code.

Fixes #1243