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Change andrejv.github.com to andrejv.github.io.

Fixes #276.
Check that caar of an expression is a symbol before using get on it.

Fixes #273.
Removed AC_CANONICAL_TARGET.
Increase toolbar icons.
Merge branch 'master' of github.com:andrejv/wxmaxima
Improve the German locale

This is a mixture of several small improvements.
Merge pull request #285 from jondo/german-locale-changes

Improve the German locale
Correct the check for draw version (patch from M. Rodriguez).
Merge branch 'master' of github.com:andrejv/wxmaxima
fixed version in wxmathml.lisp
updated makefile with correct instructions for building on Linux from scratch. closes #287