Merge pull request #2 from rfrank/develop

resync Develop
Make h1-h3 css overridable through .de statements
bugfix: lang spec inside link
bugfix: .nr handling error
Merge pull request #22 from davem2/bugfix-h1h2h3-css-override

Make h1-h3 css overridable through .de statements
release 3.33
Merge remote-tracking branch 'upstream/develop' into develop
Don't scan literal blocks (.li ... .li-) for HTML lang specifications.
Merge pull request #28 from wf49670/develop

Develop
bugfix: .sp pvs into .hr and .tb
bugfix: optimized .sp pvs into .hr and .tb
bugfix: LANG attribute
LANG -> lang attribute fix
version 3.34
.li warning when placing .pn
.li warning when placing .pn
Fix for issue with ' character contained in .il alt parameter
Merge pull request #30 from davem2/bugfix-alt-apostrophe

Fix for issue with ' character contained in .il alt parameter. Thank you David.
version 3.35
More robust error handling for .dm command

Enhanced .dm to detect several error situations and issue error message
rather than terminating with Python stack trace:
(1) .dm without a macro name
(2) missing .dm- (either hit another .dm or end-of-file)