added the function for optimal squeeze angle. Works for A+

Nice to have optimal filter cavity'ing for some things.. Not going to fix optimaloptimal until I'm certain I know how it is supposed to work (the calculation is substantially harder than for plain squeezing).

added 5 commits

• c6f06104...caca029e - 4 commits from branch gwinc:master
• 34ffbd9b - added the function for optimal squeeze angle. Works for A+

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approved this merge request

merged

mentioned in commit 83d69c46