Processed: reorganize test failure bugs

[Debian Bug Tracking System]

Processing control commands:

> retitle -1 pandas: some I/O tests (hdf5, Stata) fail on non-x86
Bug #877419 [src:pandas] pandas FTBFS on !x86/ppc64el: test failures
Changed Bug title to 'pandas: some I/O tests (hdf5, Stata) fail on non-x86' from 'pandas FTBFS on !x86/ppc64el: test failures'.
> affects 877754 src:pandas
Bug #877754 [python3-numpy] NaN -> datetime = 0 (not NaT) on arm*
Added indication that 877754 affects src:pandas

-- 
877419: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=877419
877754: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=877754
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