removed old code that moved cache files to new location
removed unused emit() methods from XML classes
EXTRA_LIBS is not used anymore
Don't override CXXFLAGS in configure script

Breaks standard things like:

     make CXXFLAGS="-g -O0 -pg"
Don't override CPPFLAGS and LDFLAGS in configure

For the same reasons as the previous commit
merged branch 'misc_build_fixes' of https://github.com/khaledhosny/dvisvgm
link tests against FreeType library
minor fixed to README.md
renamed XMLElementNode::findDescendants() and made it constant
remove redundant clipPath elements from generated SVG files
added VC++ project files
added missing whitespace boundaries in PS code
removed unused static functions
set version to 1.8.1
updated NEWS
Added tag 1.8.1 for changeset 245acbe63795
replaced namespace 'ios_base' with 'ios'
ensure that colors set by a color special are always considered by the PS handler
Add an opt2cpp Python script

A very ugly script that should work as a drop in replacement for the
opt2cpp XSLT.