Added possibility to parse bob packages with versions

FindBob.cmake

@@ -68,6 +68,15 @@ macro(_recurse_requirements requirements)
     # check if string starts with bob
     string(FIND ${_req} bob _pos)
     if (NOT ${_pos} EQUAL -1)
+      # check if any versioning is added
+      set(_chars "=;<;>; ")
+      foreach (_char IN LISTS _chars)
+        string(FIND ${_req} ${_char} _pos)
+        if (NOT ${_pos} EQUAL -1)
+          string(REPLACE "${_char}" ";" _temp ${_req})
+          list(GET _temp 0 _req)
+        endif()
+      endforeach()
       # find bob package recursively (will not run if pacakge was already found)
       find_bob_package(${_req})
     endif()
@@ -199,7 +208,9 @@ if (NOT Bob_FIND_COMPONENTS)
 endif()
 
 # set Bob source directory, if not given yet (i.e., no FORCE option here)
-set(BOB_SOURCE_DIR ${CMAKE_SOURCE_DIR} CACHE STRING "Source directory of Bob packages")
+if (NOT BOB_SOURCE_DIR)
+  set(BOB_SOURCE_DIR ${CMAKE_SOURCE_DIR} CACHE STRING "Source directory of Bob packages")
+endif()
 
 # set BOB_PREFIX_PATH as CMake variable when given in as environment variable
 if (NOT "$ENV{BOB_PREFIX_PATH}" STREQUAL "")