Fix account_partner_balance report

[ADD] Add in .gitignore file .settings file from eclipse
[FIX] Fix account_partner_balance_report. Fix compute_exchange_rate
method in odt and py file
[FIX] Fix template odt in compute_exchange_rate function
Fix template odt in xml record on base64 codification

[FIX] Fix template odt in xml record on base64 codification
Merge pull request #2 from CLEARCORP-dev/7.0-account_partner_balance_report-dr

7.0 account partner balance report dr