Refactored excel.Excel to use data from new BO. added tests for Excel.

Business object software used to pull data from flexcube has been
migrated online so that the desktop version doesnt work again. I
thus have to refactor excel.Excel to use this new format. cashsec.py
also reformated to use new format. Testing has begun for excel.Excel.
Make zakhem charge payment instruction (CFC) from admin.

I also had to refactor other printer objects (dealers, trops)
to factor out common functionalities.
Refactored excel.Excel to use data from new BO. added tests for Excel.

Business object software used to pull data from flexcube has been
migrated online so that the desktop version doesnt work again. I
thus have to refactor excel.Excel to use this new format. cashsec.py
also reformated to use new format. Testing has begun for excel.Excel.
Converted ibdint.py to new BO.

Did some refactoring of excel.py. Now excel.Excel handles all
operations common to all the recons classes. I understand this may
break a lot of codes and so I will have to refactor all the recons
classes. I have also started adding tests to prevent regression
in the future.
Successfully refactored chgs.py to use data from new bo.

Everything tested on live code and passed. Now I am taking request
for the charges produced to dealers.
Updated chgs.admin to enable updating date of ticket request from admin.

Before, it was only date ticket moved that could be updated from
admin. I have now added code to enable updating date ticket requested
from admin.
chgs.printer now takes care of cases where requesting bank differs
from credit account bank.

For such cases, there is a SWIFT message for movement instruction.
Trops expects us to print this instruction and attach it to back
of our own instruction.
Changed dealerr's address from Treasury to Dealers.
Modified entries.py to return something to indicate entries
successfully created.
Pruned unwanted files.

Many files have accumulated over time that are no longer required.
I am feeling lazy so I decided to remove them rather than to be
doing some productive work.