Discourse spam protection

[robe]

There seems to be someone spamming our osgeo forum and general for the past day or so.

I'm going to lock down the spam protections bit more to mitigate

For one

1) Not allowing anyone posting to osgeo feedback without moderation

2) newuser max links change from 6 back to the original 2

3) Change email time window from 2 minutes back to 5 minutes (default is 10)

4) Reset max image size back to default of 4MB (was 100 MB)

5) Min first post typing time -- was set to 600, reset it back to default of 3000 milliseconds (this just forces the post into needs approval queue