Introduced new exceptions and fixed a parsing bug.

* The exceptions RuntimeError, FatalRuntimeError, CantLoadTemplate and
  CantSaveTemplate were introduced.
* RuntimeErrors are automatically catched by the template engine and
  will be displayed instead of the tag, unless the parameter
  $mute_runtime_errors was set to true.
* Missing tags will result either in a RuntimeError or, if
  $fatal_error_on_missing_tag is true, in a FatalRuntimeError.
* The mktag-subcompiler and the standard library functions now use the
  new exceptions.
* A bug, that threw away leading TextNodes if a comment or rawtext
  pseudotag was parsed, is now fixed.

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