Moved from Sprint 20160613

Several sub-tasks done, but a few remaining.

Create an Admin GUI for the lexicon database.
A simple web based GUI, that calls the HTTP lexicon server.

Subtasks;

• Define lexicon: lexicon name and symbol set name
• Define symbol set for a specific lexicon: list the legal phonetic symbols + meta info (description, mapping to IPA symbol, etc). Simple editor for choosing IPA characters. Read symbol set from file.
• Import: Load existing lexicon entries from a text file (in a predefined tab separated format). Needs validation of input data.
• Export: Dump a lexicon into a text file
• Rename a lexicon and/or its symbol set