Merge pull request #3 from mhurst4186/master

fail message for tabs in fixed-form
update TODO
Normalize -> Unquoted in normalizing grammars & code
update TODO
update TODO
add debug mode to pppts
update TODO
work on a string-hiding mechanism for normalization
add tests for string literals in format stmts with h edit-descriptors
update TODO
replace 'control' ostruct /w explicit arguments; t0256 tests not really passing
restore two globals in pppts.rb -- t0256 tests now fail properly
temporarily move failing OMP tests aside
accept & stringify holleriths in data statements
fix bug in restore_strings() & modify tests to cover the bug
factor out string-masking methods
move string-masking logic into Stringmap class
update TODO
cosmetics
improve use of modules & classes (don't pollute Object with Translator methods)