Stress test redesigned, needs save methods and excel interaction.

Relates to #69 #69 #129
Implemented streams operators and save to zip file for new stress test

Relates to #69 #69 #129
Bi-Dimensional input through excel for Stress Test
Stress test work with new input

Too slow
Stress Tests working 1 table at a time
Applied stress scenario to reinvested bonds

Fixed on excel interaction
Migrated to QuaZip 0.7
Loss Input and Output Completed

Multiple Stress in same file
Stress DM plots implemented
Started Redesign of Standalone Stress Test
Updated standalone stress test
rewriting stress viewer
Fixed Bug In Trigger Evaluation.

Vectors now use template method in base class to return value
Stress viewer implemented
Closes #140
Fixed Bug in OC cure calculation

Fixed Bug in Waterfall loading from file
Connected error signals in Stress Test
Implemented widget for new waterfall
Bugfix in allocation of cash in OC

QuaZip moved to external library
Work in progress

Stress doesn't go on as expected
Stress progress fixed.

Need to inherit the abstract calculator with waterfall and Mortgage calculators
Moved waterfall calculator to inherit from interface
Fixed bug in trigger evaluation of not operator
Bug in excel input for stress test
Completed redesign of stress test.

Closes #142
Closes #141
Closes #129
Closes #69
Closes #68
Relates to #127 : Test targets are saved but not used yet
Step back in #77 due to unresolved issues with DB connection