segment lengths calculated from cache files reguardless of skip-datafind in bayeswave-pipe

By not specifying the correct segment length, BayesWaveCleanFrame can segfault

This would fail if --cache-files weren't provided & --skip-datafind was on (which would fail earlier) Also fixes issue with the environment sourcing script that would append usr/bin to the front of the path

requested review from @meg.millhouse and @james-clark

assigned to @sophie.hourihane

added 1 commit

• fa43a569 - gets rid of /bin being appended first in path

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mentioned in commit 52ed0361

merged