Added additional gsl headers

Older compilers would warn about implicit function declaration, e.g.:

gstlal_denoiser.c:240:2: warning: implicit declaration of function 'gsl_sort_vector_float_index' [-Wimplicit-function-declaration]

Newer compilers would error out.
13 jobs for master in 39 minutes and 20 seconds (queued for 2 seconds)
Status Job ID Name Coverage
  Level0
passed #1157657
level0:rpm:gstlal

00:04:11

 
  Level1
passed #1157659
level1:rpm:gstlal-ugly

00:02:33

 
  Level2
passed #1157663
level2:rpm:gstlal-burst

00:01:17

passed #1157662
level2:rpm:gstlal-calibration

00:04:23

passed #1157661
level2:rpm:gstlal-inspiral

00:06:40

 
  Test Gstlal
passed #1157664
test:gstlal

00:03:10

 
  Test Inspiral
passed #1157665
test:gstlal-inspiral

00:03:03

 
  Test Burst
passed #1157666
test:gstlal-burst

00:00:58

 
  Test Offline
failed #1157667
allowed to fail
test:offline

00:01:09

 
  Docker
passed #1157668
docker:el7

00:04:02

 
  Docker Latest
passed #1157669
latest_image

00:02:17

 
  Nightly Pages
passed #1157670
pages

00:11:12

 
  Deploy
passed pages:deploy

00:00:03

 
Name Stage Failure
failed
test:offline Test Offline
    elem.Name = name
File "/usr/lib64/python3.6/site-packages/ligo/lw/ligolw.py", line 163, in setter
self.setAttribute(name, enc(value))
File "/usr/lib64/python3.6/site-packages/ligo/lw/ligolw.py", line 472, in enc
raise ValueError("invalid Name '%s'" % name)
ValueError: invalid Name 'Sn(f)'
make: *** [H1_psd.xml.gz] Error 1
Cleaning up file based variables
ERROR: Job failed: exit code 1