Added new DCMTK modules "dcmtract" and "dcmpmap".

These two (still pretty new) modules were missing in the README file.
Also updated description of "dcmsr" module in order to be consistent
with the Doxygen file.

README

@@ -16,13 +16,15 @@ DCMTK contains the following sub-packages, each in its own sub-directory:
     dcmjpeg  - a compression/decompression library and utility apps
     dcmjpls  - a compression/decompression library and utility apps
     dcmnet   - a networking library and utility apps
+    dcmpmap  - a library for working with parametric map objects
     dcmpstat - a presentation state library and utility apps
     dcmqrdb  - an image database server
     dcmrt    - a radiation therapy library and utility apps
     dcmseg   - a library for working with segmentation objects
     dcmsign  - a digital signature library and utility apps
-    dcmsr    - a structured report library and utility apps
+    dcmsr    - a structured reporting library and utility apps
     dcmtls   - security extensions for the network library
+    dcmtract - a library for working with tractography results
     dcmwlm   - a modality worklist database server
     oflog    - a logging library based on log4cplus
     ofstd    - a library of general purpose classes