[TASK] (refract): remove obsolete ID strings

CVS ID keyword strings were remove with commit 2e81e847 on 2015-11-23.
Some secondary string variables were missed then. Remove them now.

src/ts/refract/sub/refract_cmdopt.f

@@ -316,8 +316,6 @@ c
       pg_syntt_lw=opt_Lttwidth
 c
       return
-c the following line prevents the linker from removing the ID string
-      print *, refract_cmdopt_id
       end
 c
 c ----- END OF refract_cmdopt.f -----

src/ts/refract/sub/refract_pgdefaults.f

@@ -52,8 +52,6 @@ c prefer blue over green
       call pgscr(4, 0., 1., 0.)
 c
       return
-c the following line prevents the linker from removing the ID string
-      print *, refract_pgdefaults_id
       end
 c
 c ----- END OF refract_pgdefaults.f -----

src/ts/refract/sub/refract_preread.f

@@ -66,8 +66,6 @@ c taper file
       endif
 c
       return
-c the following line prevents the linker from removing the ID string
-      print *, refract_preread_id
       end
 c
 c ----- END OF refract_preread.f -----

src/ts/refract/sub/refract_selfilestyle.f

@@ -51,8 +51,6 @@ c go
       endif
 c
       return
-c the following line prevents the linker from removing the ID string
-      print *, refract_selfilestyle_id
       end
 c
 c ----- END OF refract_selfilestyle.f -----

src/ts/refract/sub/refract_usage.f

@@ -330,8 +330,6 @@ c
       call sff_help_formats
       stop
 c
-c the following line prevents the linker from removing the ID string
-      print *, refract_usage_id
       end
 c
 c----------------------------------------------------------------------