Small analyze_prs improvements

[jerry-skydio]

Don't error out if num users provided is greater than
returned total.

Drop users with 0 total prs.

Always sort by both total and revup_total, order changing
depending on args. This way listing of users with the
same number in one will still be sorted in the other.

Print percents in a few places as well.

[jerry-skydio]

Reviews in this chain:
└#149 Small analyze_prs improvements

[jerry-skydio]

#	head	base	diff	date	summary
0	437ce87d	0fc6b0ec	diff	Mar 11 11:03 AM	1 file changed, 6 insertions(+)
1	e124811a	0fc6b0ec	diff	Mar 11 11:29 AM	1 file changed, 10 insertions(+), 3 deletions(-)