Added registry for extension capabilities like the available notify methods and adjusted the enotify extension accordingly.

Made lda plugin properly refer to the main script as 'main script' and not the basename of the sieve file (which is of no interest to the user for the main script).

Made error reporting cleaner by avoiding the scriptname of the main script and indicating that the printed numbers are in fact source code lines.

Properly implemented the code dumper. Dumps are now printed in a stream. The individual opcode and operand implementations no longer use printf()s.

Almost finished implementing the store action. But, I still get strange errors when the mail transaction commits. Mail is stored though.