Use butt cap for strokes of major/minor ticks, to avoid going past the axis line with large width

git-svn-id: svn+ssh://rubyforge.org/var/svn/tioga/trunk/tioga@624 f6f669a6-2b79-499e-8f05-be2b991fc3d0
Improve error reporting on missing pdflatex + provide the possibility to give the location of pdflatex via the TIOGA_PDFLATEX environment variable

git-svn-id: svn+ssh://rubyforge.org/var/svn/tioga/trunk/tioga@625 f6f669a6-2b79-499e-8f05-be2b991fc3d0
Use RbConfig instead of Config

git-svn-id: svn+ssh://rubyforge.org/var/svn/tioga/trunk/tioga@626 f6f669a6-2b79-499e-8f05-be2b991fc3d0
Do not assume the system runs a unix-like shell, we may be able to make it to windows after all

git-svn-id: svn+ssh://rubyforge.org/var/svn/tioga/trunk/tioga@627 f6f669a6-2b79-499e-8f05-be2b991fc3d0
Make pdflatex errors available to users

git-svn-id: svn+ssh://rubyforge.org/var/svn/tioga/trunk/tioga@628 f6f669a6-2b79-499e-8f05-be2b991fc3d0
Prepare for release 1.16

git-svn-id: svn+ssh://rubyforge.org/var/svn/tioga/trunk/tioga@629 f6f669a6-2b79-499e-8f05-be2b991fc3d0