Fix bug in initialisation of TmpPPerm

[james-d-mitchell]

Please make sure that this pull request:

• is submitted to the correct branch (the stable branch is only for bugfixes)
• contains an accurate description of changes for the release notes below
• provides new tests or relies on existing ones
• correctly refers to other issues and related pull requests

Tick all what applies to this pull request

• Adds new features
• Improves and extends functionality
• Fixes bugs that could lead to crashes
• Fixes bugs that could lead to incorrect results
• Fixes bugs that could lead to break loops

Write below the description of changes (for the release notes)

The function ResizeTmpPPerm did not correctly initialise TmpPPerm, the
bag was too small. A similar fix was made relatively recently by CAJ to
ResizeTmpTrans. I can't provide an example where this causes a problem,
but it was causing a seg fault in the tests for the Semigroups package.

[codecov-io]

Current coverage is 48.72% (diff: 0.00%)

Merging #948 into master will decrease coverage by 0.02%

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  Lines        222138     222137     -1   
  Methods        3431       3431          
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- Hits         108312     108245    -67   
- Misses       113826     113892    +66   
  Partials          0          0          

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[ChrisJefferson]

This is obviously right.

[wilfwilson]

Yes I remember that this was causing segfaults. Glad it's fixed.