Add Debian packaging

See merge request !7

ref #32 the old Bham CI server isn't running anymore, disabling CI until we can sort out a new approach

Allow for more architectures, build for amd64, i386, arm64

See merge request !6

No dependency on x86 intrinsics, so finesse can be built for non-x86 architectures. Suggested by Daniel Brown on 2021-08-16

Fix compilation with GCC 10 (Fedora 32)

See merge request !5

More minus sign changes on angular couplings. Got missed back when all the minus signs were being changed before.

Fixing issue with tf2 where it duplicates real poles and zeros, only doubles and conjugates complex ones now

Adding in powershell script environment variables otherwise the conda powershell prompt doesn't work

Fixes to astigmatic lens component. Now has lens** and lens*** for astigmatic focal and power definitions