Fix UF-8 encoding of sin^{-1} in options.
Further unit tests, and added an edge case to ATSysEquiv.
Refactoring the $this->errors in castext as an array to better deal with errors.
Removed submodule
Removed subdirectory
Hardwired in the php-peg library.
Merge branch 'master' into wipcasblocks
Remove debugging noise script.
Code tidy...