Cherry picking commits for importing the statement_base_import module
Removed lsv_dd module wich will be in separate branch.
PEP8
Added external dependencies check.
PEP8
Add xml to attachments for postfinance statement import.
[FIX] raiffeisen line parsing, get only last element for amout parsing
[FIX] binary file postfinance import bug
Added example files with import unit tests. Corrected some bugs.
Fixed importation order problem. Added missing modifications to commit.
Merge pull request #8 from CompassionCH/7.0-statement-import

7.0 statement import