Add ability to specify libraries to link with (and set the lib search dir)
Fix tests
Add a new tab to the preferences settings to edit dbpre config and .param config (db connection parameters)
Add ability to create new .scb files
Cleanup and refactoring need to be able to import settings in compiler.py

While doing I also cleaned up imports
Implement the dbpre compiler interface

Now you can compile and run sql cobol files :)

#82
Fix tests
Integrate master branch

Conflicts:
	open_cobol_ide/controllers/edit.py
	open_cobol_ide/linter.py
Fix compiler modules

conflict not solved properly in last commit
Show a warning when attempting to compile a file and the compiler is not working

this is especially needed for dbpre because it's config is optional and the user has to know it's up to him to configure the dbpre compiler.
Make use of the existing custom compiler path to choose an alternate
compiler path
Add support for compilers built with Visual Studio
Fix cobc_wrapper path

(it was working previously because I still had that batch in my path that I used for experimentation)
Temporary fix for libraries dir (works if only one)

A better fix conists in having a list widgets where the user can easily add custom path using a directory dialog
Merge pull request #91 from OpenCobolIDE/sql

Feature: SQL Cobol support through dbpre