bricks: details version and modifications

* README, spot/bricks/README: Here.

README

@@ -328,7 +328,7 @@ lib/              Gnulib's portability modules.
 utf8/             Nemanja Trifunovic's utf-8 routines.
 elisp/		  Related emacs modes, used for building the documentation.
 picosat/          A distribution of PicoSAT 965 (a satsolver library).
-spot/bricks/      A collection of useful C++ code provided by DiVinE 3.3.2
+spot/bricks/      A collection of useful C++ code provided by DiVinE
 
 Build-system stuff
 ------------------

spot/bricks/README

@@ -0,0 +1,19 @@
+Bricks is a collection of useful C++ code, organised in standalone
+header files. By default, the code uses the latest stable C++ standard.
+Bricks is publicly available at:
+       https://github.com/paradise-fi/divine/tree/master/bricks
+
+This directory only contains the necessary subset to have a
+multithreaded hashmap in Spot. The integration with Spot requires
+modifications of the original files:
+    - prefer <spot/misc/clz.hh> to builtin clz
+    - use SPOT_FALLTHROUGH when required
+
+In addition to the previous modifications, and to please both GCC and
+Spot compilation options, the following changes have been made:
+    - add missing override
+    - add missing = default
+    - add missing default values
+
+
+This directory contains the current version of Bricks as of Divine 3.3.2.