a word about thrad safety; linking to first entry in doxygen if there are...

a word about thrad safety; linking to first entry in doxygen if there are multiple; some more link fixes
8 jobs for master in 8 minutes and 19 seconds (queued for 1 second)
Status Job ID Name Coverage
  Build Homepage
passed #2231
job_build_homepage

00:00:11

 
  Build Gcc
passed #2232
job_make_gcc

00:01:10

 
  Test Gcc
passed #2233
job_test_gcc

00:01:50

92.453%
 
  Build Gcc Nocheck
passed #2234
job_make_gcc_nocheck

00:01:07

 
  Test Gcc Nocheck
passed #2235
job_test_gcc_nocheck

00:00:15

 
  Build Python
passed #2236
job_build_python

00:01:35

 
  Build Clang
passed #2237
job_make_clang

00:01:55

 
  Test Clang
passed #2238
job_test_clang

00:00:12