Fixes another 10 Sinhala failures.  Down to 148 (0.0544424%).

Apparently if there is C,V,ZWJ,C, the first C will be base, but if
it's C,ZWJ,V,C, the second one will be.

Note that Uniscribe implements this differently, by breaking syllable in
the case of C,ZWJ,V,C and putting the first consonant in one syllable
and the rest in the next syllable.

Sinhala failures down from 208 to 158 (0.0581209%).  No changes to
Khmer.

Sinhala does not have half forms.  And most (all?) consonants can be
base, except when preceded by ZWJ, which would request a subjoined form.
Hence switch the base algorithm to categorize with Khmer, start search
at start, and stop at a ZWJ.

Also, mark all pos=base consonants after base to be subjoined.  Mark
base itself to have pos=base.

Finally, adjust Sinhala's reph position to after-main.

Brings down Sinhala failures from 455 to 328 (0.120656%).

Only skip actual ligatures, not marks in-between ligature components.

If, say, a H,ZWJ,C ligature was formed, we don't want the code to detec
that as a Halant.  So, ignore ligatures when matching category in
final_reordering.

Sinhala failures down from 514 to 455 (0.167374%).

We now limit syllable lengths in the machine.  No need to match here.

Test case was: <U+0D15,U+0D4D,U+0D15,U+0D4A>.

This should address all possible cluster misformations that I had in
mind.

This should fix any instabilities in cluster formation that we were
speculating may happen with surrounding syllables.  Or most of it
perhaps.

Fixes crashes reported with left matra under
non-uniscribe-bug-compatibilty mode.

Improves Bengali and Gurmukhi.  Malayalam regressed a bit.  We will deal
with that later.

This is a bunch of hacks for now.

Improves Bengali a bit.

Fixes 20 out of 48 failing Oriya tests.  Failure rate down to 0.066% now.

Oriya failures down from 0.65% to 0.20%.

Fixes most Malayalam failures.  Down from 1.6% to 0.38% now.  Fixes a
few more in other scripts too.

Apparently this was approved in Feb 2012.  No font yet.

Now that we break syllables on Halant,ZWNJ, this code can be simplified.

That's really what Uniscribe does, and explains a lot of pecularities of
Halant,ZWNJ before the base.

Sent Telugu from 1% failures to 0.03%.  Improved Kannada and Malayalam
slightly.  Fixed half of Bengali, and did NOT break anything!

Specifically, don't apply 'init' if previous char is a joiner.

Fixes some more of Bengali.

Not tuned, just copied from step 2.  Fixes another 0.5% of Kannada
failures.  1% to go.

Fixes a few Devanagari, half of remaining Kannada failures, quarter for
Telugu, and others slightly improved or unchanged.

Fixes 5 Devanagari failures, and no regressions.

Brings down failures with Lohit-Telugu from 57% to 1.40%.

Kannada failures down from 3.5% to 2.93%.

It's not in IndicSyllabicCategory.txt.  Fixes most of Gurmukhi failures.
Failures down from 7.7% to 0.222%!

For Khmer, all consonants are subjoining.  No need to look in the font.
We were looking in the wrong order anyway.

Fixes 1.5% more failures for Telugu, 2% for Kannada.
Breaks one test in Devanagari.

Fixes another 5% of Kannada failures.

Fixes most failures of Oriya, and improves others a bit.

Following what the spec says.

Brings down Telugu failures from 40% to 3.75%, and Kannada failures from
44% to 10%.  Does NOT affect other scripts' test results.

POS_BASE can disappear if base ligated backward.  Define base as last
with position not after base.

Fixes a few hundred of Sinhala failures with Iskoola Pota.