Substitution key editor: introduced an editor in the substitution
cipher, which allows editing the single character substitutions.

Also fixed many bugs/glitches in the classic crypto algorithm wizards
(- alphabet content display (show special and control characters)
 - alphabet selection: bug when creating an unstored custom alphabet
 - substitution key input dialog: double characters are now prohibited
 - Tooltip for showing alphabet content in classic crypto wizard fixed
 - ...
)
Fixed alphabet file validation bug in (old) alphabet storage system
removed system.out calls
Replaced the substitution algorithm key feld with a substitution editor
(Full control over substitutions)
 Additionally:
Fine control (framework) features added to / glitches fixed for the
input validation messages in classic algorithm wizards
Merge branch 'master' of git@github.com:jcryptool/crypto.git
Merge branch 'substitution'
Ensuring, that fields of (old) Alphabet storage class are initialized
(prone to errors on loading the alphabet store)
UI improvements for classic substitution algorithm