Set tweak version in setup.py

Annoyingly, PEP440 and semantic versioning conflict with each other.
This creates a new variable to overcome that which will automatically
synchronize the two.

Framework/PythonInterface/setup.py.in

@@ -13,7 +13,7 @@ from setuptools import find_packages, setup
 # The most basic setup possible to be able to use setup.py develop
 setup(
     name='mantid',
-    version='@VERSION_MAJOR@.@VERSION_MINOR@.@VERSION_PATCH@',
+    version='@VERSION_MAJOR@.@VERSION_MINOR@.@VERSION_PATCH@@VERSION_TWEAK_PY@',
     packages=find_packages(exclude=['*.test', 'plugins*']),
     package_data={'': ['*.ui']},
     @SETUPTOOLS_BUILD_COMMANDS_USE@

buildconfig/CMake/VersionNumber.cmake

@@ -9,7 +9,19 @@ set ( VERSION_MINOR 0 )
 set ( VERSION_PATCH 0 )
 
 # The tweak is mean to keep in line with the pre-release numbering.
+# https://semver.org/
 # examples: First release cadidate for tweak 1 is "-1-rc.1"
 #           Second release cadidate for tweak 1 is "-1-rc.2"
 #           Actual tweak release is "-1"
 set ( VERSION_TWEAK "-1-rc.1" )
+# pep440 is incompatible with semantic versioning
+# https://www.python.org/dev/peps/pep-0440/
+# example: First release cadidate for tweak 1 is ".1rc.1"
+string ( REPLACE "-rc."
+                 "rc"
+                 VERSION_TWEAK_PY
+                 ${VERSION_TWEAK})
+string ( REPLACE "-"
+                 "."
+                 VERSION_TWEAK_PY
+                 ${VERSION_TWEAK_PY})

qt/applications/workbench/setup.py.in

@@ -13,7 +13,7 @@ from setuptools import find_packages, setup
 # The most basic setup possible to be able to use setup.py develop/install
 setup(
     name='MantidWorkbench', # probably the wrong name if someone wants to include it
-    version='@VERSION_MAJOR@.@VERSION_MINOR@.@VERSION_PATCH@',
+    version='@VERSION_MAJOR@.@VERSION_MINOR@.@VERSION_PATCH@@VERSION_TWEAK_PY@',
     install_requires=['mantidqt'],
     packages=find_packages(exclude=['*.test']),
     package_data={'': ['*.ui']},

qt/python/setup.py.in

@@ -13,7 +13,7 @@ from setuptools import find_packages, setup
 setup(
     name='mantidqt', # must match what is required by workbench setup.py
     install_requires=['mantid'],
-    version='@VERSION_MAJOR@.@VERSION_MINOR@.@VERSION_PATCH@',
+    version='@VERSION_MAJOR@.@VERSION_MINOR@.@VERSION_PATCH@@VERSION_TWEAK_PY@',
     packages=find_packages(exclude=['*.test']),
     package_data={'': ['*.ui']},
     @SETUPTOOLS_BUILD_COMMANDS_USE@