Updated README

README.md

 
-# ESS customized require originated from PSI
+# ESS require
 
-The following files are touched:
+`require` is a fork of [PSI require](https://github.com/paulscherrerinstitute/require). Multiple changes 
+have been put in place to fit within the e3 concept, some of which are outlined below. This is not truly
+a stand-alone EPICS module, but fits together with its "e3 wrapper", located at
+[e3-require](https://gitlab.esss.lu.se/e3/e3-require). Documentation for this can be found at 
+[e3.pages](http://e3.pages.esss.lu.se/design/2_require.html).
 
-* require.c
-* driver.makefile
+## Changes from PSI require
 
-And ESS doesn't use iocsh, we have the indepdent iocsh.bash (under tools).
+The main changes are the following. In all cases we have removed support for EPICS base 3.x, as well as
+VxWorks. Other changes
 
+* require.c: We have changed the way that versioning is handled to include the option of build numbers, which
+  we have found are necessary to handle some dependency issues. See the above documentation.
+* driver.makefile: A lot of simplifications have been added based on ESS's requirements (in particular, not
+  needing to have EPICS base 3.x and 7.x together). There are also a number of additions to allow some extra
+  flexibility in installing e.g. header files.
+* iocsh.bash: We have replaced the PSI startup script `iocsh` with an ESS version, `iocsh.bash`. 
 
-# Compatibility with different versions of require
-
-* http://github.com/icshwi/require-ess
-
-  The differences here are that require-ess forces the IOC developer to specify a verions number, which does not
-  make sense in the context of using Conda as a deployment tool. As a result, this build is currently up-to-date with
-  https://github.com/icshwi/require-ess/releases/tag/v3.1.2
-
-* http://github.com/paulscherrerinstitute/require
-
-  All of the commits up until https://github.com/paulscherrerinstitute/require/tree/912cccdbd3ebff32210b0e6331886049f9748770
-  are included in this branch; the remaining commits until https://github.com/paulscherrerinstitute/require/tree/2439791953107fa1a88bdfcd8aa4554dc2ec3a6a
-  are to support further control over matching module versions, which is not necessary in Conda. As such, we consider this release to be
-  up to date with https://github.com/paulscherrerinstitute/require/tree/2439791953107fa1a88bdfcd8aa4554dc2ec3a6a
-
-# Original README
-
+# Original PSI README
 
 ```
 require "<module>" [,"<version>"] [,"<macro1>=<value2>, <macro2>=<value2>"]