* Use EXPAND_COMMON for architecture-independent templates,
generated in the O.Common directory instead of O.$(T_A).
* Add EXPAND_ME to name Makefile variables to be added without
having to provide a value (permits spaces in value too).
* Comments in RULES_EXPAND describe how to use these rules.
Added support for a _PATTERN variable which calls $(wildcard) and
prepends .. and the other SRC_DIRS automatically.
Use $(ECHO) instead of @echo so make -s works silently.
Added another meta-rule to create .d files when make needs one.
* Move the construction of the .pc files into src/tools
* Make more use of the built-in rules for variable substitution
* Make PKGCONFIG an Makefile variable for installing .pc files
* Use EPICS_PATCH_LEVEL for the final digit in the version number
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