INI parser. Cleanup. Prep for INI validation.

This patch addresses several issues:
a) Cleaning unit test to match coding standard
b) Replace tabs with spaces - I do not know where they came
but there were some.
c) Allowing to read file and keep aside a collection
of K-V pairs where key is the key in the INI file and value is the
line number on which line the key apears.
d) There will be different kinds of errors so
error printing function was abstracted.
g) Placeholders for other printing functions have been introduced.

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