fix tab indentations in Fscan python codes
Description
I found #127 (closed) still lying around unresolved and this MR should make
python3 -m py_compile src/pulsar/Fscan/*.py
pass. (At least it does so with Python 3.5.3 on my Debian 9 installation, which I'm aware isn't terribly up-to-date...)
API Changes and Justification
Backwards Compatible Changes
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This change introduces no API changes -
This change adds new API calls
Backwards Incompatible Changes
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This change modifies an existing API -
This change removes an existing API
Review Status
@keith-riles or @gregory.mendell please double-check carefully that no loop/statement blocks are broken by the re-indentation, as the old tab use was so inconsistent that after an automatic tab replacemen I already had to fix a few lines, and can't 100% guarantee I caught all such cases.