Better error problems

• https://cfengine.com/dev/issues/1507 - Could you please make the first line of "syntax error" output stand out?

• https://cfengine.com/dev/issues/1508 - Hint if the user does not terminate a statement.

• https://cfengine.com/dev/issues/1509 - LHS is supposed to be CFEngine reserved word only. Provide a hint if the user puts something else there (such as an RHS value). That happens often when learning.

• https://cfengine.com/dev/issues/1510 - Could you please replace "!!! No bundlesequence in the common control body" with " !!! No bundlesequence in the common control body or on the command line"

• https://cfengine.com/dev/issues/1511 - Is it possible to have the parser provide a hint if the user forgets to terminate a quote?