The new class WorkspaceNameAppender returns the changed workspace name for 4 operations:
Sum, Subtract, Scale and Rebose.
This implementation makes it easier to change the naming conventions if needed.
Altered tests to import this class, so that tests get updated if naming convention changes.

- Altered class for ws name handling of ws operatiosn
- Started looking into other sections of code where names of ws are altered
- Changed some parts of algorithm wrapper and scripting files
- Currently it's a mess because I don't understand what these routines are doing yet

- Named methods in WorkspaceNameHandler according to their function
- replaced several parts of code with new methods

- Removed '.' from workspaces names because might cause trouble with mantid
- Added two methods for appending sufixes to workspaces

- Checked that changing the suffixes in my code makes tests fail
- The prefixes '__MSL', '__MSLTMP' and suffix '_HIDDEN' are not covered by the unit tests

- Prevented scaling factor in workspace names from having more than 2 decimal places

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This reverts commit 9883cf5.