Fetch Defaults Changed

Some fetch lib defaults were changed in Texis version 8:

• <urlcp maxpgsize> (here) increased from 512 KB to 100 MB

• <urlcp useragent> (here) changed from Mozilla/2.0 (compatible; T-H-U-N-D-E-R-S-T-O-N-E) to Mozilla/5.0 (compatible; T-H-U-N-D-E-R-S-T-O-N-E)

• <urlcp maxredirs> (here) increased from 5 to 20

• <urlcp metacookies> (here) changed from on to off