Adding documentation of options to man-page from manual. Fixing a few minor typos and mistakes.
Merge pull request #250 from ecraven/update-manpage

Adding documentation of options to man-page from manual.
Merge pull request #251 from ecraven/update-docs

first changes in adding more testable examples to ledger3.texi

These look good.  Could you put a brief explanation somewhere (not necessarily in ledger3.texi) on how to generate new tests? I should probably know where the command and input id numbers come from, but I don't.
Added support for validation tests to DocTest.py (input:validate and
command:validate)

It is now possible to use @smallexample @c input:validate (and
command:validate) to specify that an example should just be read by
ledger (and checked for errors) or that a ledger command should be
executed (with default input -f sample.dat, if none is specified).

These annotations have been added into ledger3.texi where appropriate.

Running the ledger3.texi test now takes a second or two, but a lot of
the @smallexamples are now automatically tested.