* 64-bit installer to do installation only in 64-bit architecture.
* 32-bit installer to install files in 'Program Files (x86)' on 64-bit architecture.
* Require to uninstall old x86 mode installation only for 64-bit installer on 64-bit architecture.
* compile.sh builds installer and portable zip archive for the environment the shell is running on.
* Added tuxpaint-i686.iss and tuxpaint-x86_64.iss which just define 'BuildTarget' and include tuxpaint.iss.
