Task #9127: update INSTALL wrt external AOFlagger, and URLs of casarest, IERS tables

INSTALL

@@ -40,8 +40,6 @@ For Debian/Ubuntu (likely incomplete list, but goes a long way):
 	apt-get install libboost-dev libblitz0-dev libfftw3-dev libcfitsio3-dev libxml2-dev liblog4cplus-dev
 	apt-get install libpng12-dev                         # or latest version; for AOFlagger
 	apt-get install libreadline-dev libpqxx-dev doxygen  # optional
-	apt-get install libgsl0-dev                          # optional, for AOFlagger's RayleighFitter
-	apt-get install libgtkmm-[2.4|3.0]-dev libsigc++-2.0-dev  # optional, for AOFlagger's rficonsole
 	apt-get install libunittest++-dev                    # optional, for tests that use UnitTest++
 
 
@@ -49,10 +47,7 @@ For CentOS/Fedora (likely incomplete list, but goes a long way):
 
 	yum install subversion cmake make gcc python-devel numpy
 	yum install boost-devel fftw-devel cfitsio-devel libxml2-devel libpng-devel
-
 	yum install readline-devel libpqxx-devel doxygen     # optional
-	yum install gsl-devel                                # optional, for AOFlagger's RayleighFitter
-	yum install gtkmm[24|30]-devel libsigc++20-devel     # optional, for AOFlagger's rficonsole
 
 	The blitz and blitz-devel pkgs are available on some distros, but not on e.g. CentOS 7.
 	If required for your build, but not in your repo, take the two RPMs from CentOS 6 (or build from source).
@@ -62,14 +57,17 @@ For CentOS/Fedora (likely incomplete list, but goes a long way):
 
 
 
-NOTE (any OS): For manual builds, the most prominent dependency you likely need to build is casacore (+ friends):
+NOTE (any OS): For manual builds, the most prominent dependencies you likely need to build are casacore (+ friends) and AOFlagger:
 
 	casacore:                  https://github.com/casacore/casacore
 	python-casacore ('pyrap'): https://github.com/casacore/python-casacore
-	IERS/measures tables:      https://github.com/casacore/casacore-data-update
-	casarest:                  https://svn.astron.nl/casarest
+	IERS/measures tables:      ftp://ftp.astron.nl/outgoing/Measures/WSRT_Measures.ztar (auto-updated weekly),
+                                       also see https://github.com/casacore/casacore-data-update
+	casarest:                  https://github.com/casacore/casarest
 
-	AOFlagger:                 http://sourceforge.net/projects/aoflagger/
+	AOFlagger:                 https://sourceforge.net/projects/aoflagger/
+            which may need: Debian/Ubuntu: libgsl0-dev libgtkmm-[2.4|3.0]-dev libsigc++-2.0-dev
+                            CentOS/Fedora: gsl-devel gtkmm[24|30]-devel libsigc++20-devel
 
 
 Instructions for Manual Build from Source