<issue_start><issue_comment>Title: python 3 porting of mafValidator (from mafTools) and fixed start for reversed strand
username_0: With this fix, mafValidator doesn't complain about the generated MAF files, and I've started being able to read the generated files with other tools.
<issue_comment>username_0: An example looking at the generated MAF file with [gmaj](http://globin.bx.psu.edu/dist/gmaj/).

![image](https://user-images.githubusercontent.com/62253982/93615829-3709e600-f9d4-11ea-961d-9ae58f591e52.png)
<issue_comment>username_1: Is this good to merge?
<issue_comment>username_0: Yes, it is.