Renamed convertRelease target 'STDOUT' to 'releaseTops' and fixed build files.

Removed the -h option to convertRelease, use $ENV{EPICS_HOST_ARCH} instead.
Reworked variables associated with expandVars to make it simpler to use.
Split EPICS::Utils module into three parts.
Moved code from fullPathName.pl into the new EPICS::Path module.
Changed convertRelease.pl to use new modules.
Added some documentation to RELEASE_NOTES.html

src/tools/fullPathName.pl

@@ -1,40 +0,0 @@
-eval 'exec perl -S -w  $0 ${1+"$@"}'  # -*- Mode: perl -*-
-    if 0;
-
-# Determines an absolute pathname for its argument,
-# which may be either a relative or absolute path and
-# might have trailing parts that don't exist yet.
-
-use strict;
-use Cwd qw(getcwd abs_path);
-use File::Spec;
-
-# Starting values
-my $cwd = getcwd();
-my $rel = shift;
-
-$rel = '.' unless defined $rel;
-
-# Move leading ./ and ../ components from $rel to $cwd
-if (my ($dot, $not) = ($rel =~ m[^ ( (?: \. \.? / )+ ) ( .* ) $]x)) {
-    $cwd .= "/$dot";
-    $rel = $not;
-}
-
-# Handle a pure ..
-if ($rel eq '..') {
-    $cwd .= '/..';
-    $rel = '.'
-}
-
-# NB: abs_path() doesn't like non-existent path components other than
-# in the final position, which is why we use this method.
-
-# Calculate the absolute path
-my $abs = File::Spec->rel2abs($rel, abs_path($cwd));
-
-# Remove any automounter prefixes
-$abs =~ s[^ /tmp_mnt ][]x;              # SunOS, HPUX
-$abs =~ s[^ /private/var/auto\. ][/]x;  # MacOS
-
-print "$abs\n";