Created module for configuration reader
Added parser for ini-based configuration format. The format allows
searching for options in sections related to the chosen one.
Relationship example:
For a section [A B C], [A B] and [A] are it's related sections and
consequently for [A B], [A] is it's related section
The relationship is one-way, ie [A B] is searched if [A B C] doesn't
have the sought option but if [A B] is the specified section then [A B
C] won't be searched.
Closeness of relationship:
[A B] is in closer relationship to [A B C] than is [A]
Distance of relationship is measured by how many tokens separated by
spaces a section has in common with another starting from the
left-hand-side.
An option will be sought in a more distantly related section only if not
found in a more closely related section.