never try socket connections without latexmls installed
 sort keys of attributes for LaTeXML::Post::Document::addNodes processing
 wrap kpsewhich in quotes to handle Windows unescaped spaces as returned by which()
 math attributes now ordered alphabetically, regenerating test files
careful not to overwrite manually set box sizes
tweaked the fake box dimensions
added a pxValue method to dimensions
careful about inheritting non-LaTeXML attributes to math nodes
use pxValue instead of ptValue for pixels; add missing \fi
updated tests for tweaked box sizing
added \tracingcommands; refactored conditionals to better modularize code and to better support tracing
adjustments to DefConditional to combine all conditionals, elses, etc
added tracingcommands support; refactored definitions of \else,\or,\fi and \ifcase
refactored \unless
Merge pull request #26 from dginev/windows_make_test_portability

Windows make test portability
stub binding for preview package