Handle commas in meca if -A and CSV

[PaulWessel]

See pyGMT issue.

With -A we examine the trailing text, but if those items are comma-separated then the scanning will fail since the format assumes white-space. This PR counts commas in trailing text and if 2 we change the scanning.

@seisman:

Please see if it works as is.

1. If not, please add a fprintf (stderr, trailing = %s\n", S->text[row]); so we can see the trailing text and manually check commas (not sure if there might be a leading one).
2. Once working, perhaps same is needed in other seis modules?

[PaulWessel]

Sorry, did not notice at first this was a CLI example. My fix seems to work.

[seisman]

It fixes the original issue, but what if the columns are space-separated and the trailing text contains commas, e.g.,

gmt meca -R-5/5/-5/5 -JX10c -Sa2c -Baf -A -png map << EOF
0 0 10 0 90 0 5.0 2,2,eventname
EOF

In the above case, users expect to see 2,2,eventname as the beachball title, but only eventname is shown.

[PaulWessel]

Hm, have no way of knowing if the entire file was CSV since that reading was done earlier via GMT_Read_Data. ?

[seisman]

Hm, have no way of knowing if the entire file was CSV since that reading was done earlier via GMT_Read_Data. ?

I believe so.

2. Once working, perhaps same is needed in other seis modules?

I think coupe also needs update.