Improve bootstrapping and documentation.

* GNUmakefile: Typing `make' without arguments bootstraps, configures
and builds the package.
(help) New goal.
* Makefile.am: Use AWK variable, instead of hardcoded name of the awk
binary.
* README: New file.
* README-hacking: New file.

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+* Overview
+
+This file provides instructions on how to bootstrap rex sources obtained
+from Git repository.
+
+For generic information about Rex and its purposes, please see the file
+README.
+
+* Prerequisites
+
+In order to bootstrap rex from git sources you will need the following tools:
+
+- Automake <http://www.gnu.org/software/automake/>
+- Autoconf <http://www.gnu.org/software/autoconf/>
+- Make <http://www.gnu.org/software/make/>
+- AWK <http://www.gnu.org/software/gawk/>
+
+* Bootstrapping and Building
+
+Provided that the prerequisites are satisfied, typing 
+
+  make
+
+will bootstrap, configure and build the package using the default
+configuration.
+
+If GNU awk is available under a different name or in another directory,
+use the AWK variable to indicate it, e.g.:  make AWK=gawk.
+
+* Make commands
+
+ make bootstrap    Create the configure script and auxiliary files.
+ make conf         Create the configure script and run it.
+ make help         Displays this document.
+
+Right after checkout, the commands
+
+ make
+or
+ make all
+
+are equivalent to "make conf" followed by "make".
+