GROOVY-6397: Fix: Regression for command completers
Using the colon as prefix for both shortcuts and commands revealed a quirk
of the Jline2 Argument Completer.

E.g. Completing ":s a" offered the candidates for all ":save", ":show"
and ":set" commands, due to the commond prefix.

Fixing this in JLine ArgumentCompleter does not seem trivial, so adding a
subclass here which is limited but acts more strictly as we need it.

Added more tests
Mini-feature: Completion for the :alias command,
copy-pasted from the help command
GROOVY-4063: move line number information to pre guard for primopts to make the life of debuggers more easy
Merge pull request #311 from tkruse/fix_command_completion

Fix command completion
[GROOVY-6499] Show some GroovyDefaultMethod methods for suitable instances
GROOVY-6499: :set command autocompletion for the preference limiting the Default Method completion
Merge pull request #309 from tkruse/groovy6499b

[GROOVY-6499] Show some GroovyDefaultMethod methods for suitable instances
GROOVy-6471: add a priviledged action wrapper for getDeclaredMethods
GROOVY-6512: add priviledged block for the creation of InnerLoader in ProxyGeneratorAdapter
remove @Override for JDK5
GROOVY-4279, GROOVY-4280, GROOVY-4281: allow IDIV and LDIV in safe cases
Disable Log4J tests if running on indy+jdk7