Some refactoring to fix qmake-based pymod builds

- Unify structure of Python module sources so the pymod.pri can be used for all modules
- switch to tlcore, dbcore and rdbcore + distutils_src wrapper modules

src/pymod/db/db.pro

@@ -1,5 +1,6 @@
 
-TARGET = db
+TARGET = dbcore
+REALMODULE = db
 
 include($$PWD/../pymod.pri)
 

src/pymod/pymod.pri

@@ -48,3 +48,25 @@ msvc {
   lib_target.extra = $(INSTALL_PROGRAM) $$DESTDIR_PYMOD/$${TARGET}$${PYTHONEXTSUFFIX} $(INSTALLROOT)$$PREFIX/pymod/klayout
 }
 INSTALLS = lib_target
+
+!equals(REALMODULE, "") {
+
+  msvc {
+    QMAKE_POST_LINK += && $(MKDIR) $$shell_path($$DESTDIR_PYMOD/$$REALMODULE) && $(COPY) $$shell_path($$PWD/distutils_src/klayout/$$REALMODULE/*) $$shell_path($$DESTDIR_PYMOD/$$REALMODULE)
+  } else {
+    QMAKE_POST_LINK += && $(MKDIR) $$DESTDIR_PYMOD/$$REALMODULE && $(COPY) $$PWD/distutils_src/klayout/$$REALMODULE/* $$DESTDIR_PYMOD/$$REALMODULE
+  }
+
+  # INSTALLS needs to be inside a lib or app templates.
+  modsrc_target.path = $$PREFIX/pymod/klayout/$$REALMODULE
+  # This would be nice:
+  #   init_target.files += $$DESTDIR_PYMOD/$$REALMODULE/*
+  # but some Qt versions need this explicitly:
+  msvc {
+    modsrc_target.extra = $(INSTALL_PROGRAM) $$shell_path($$DESTDIR_PYMOD/$$REALMODULE/*) $$shell_path($(INSTALLROOT)$$PREFIX/pymod/klayout/$$REALMODULE)
+  } else {
+    modsrc_target.extra = $(INSTALL_PROGRAM) $$DESTDIR_PYMOD/* $(INSTALLROOT)$$PREFIX/pymod/klayout/$$REALMODULE
+  }
+  INSTALLS += modsrc_target
+
+}

src/pymod/rdb/rdb.pro

@@ -1,5 +1,6 @@
 
-TARGET = rdb
+TARGET = rdbcore
+REALMODULE = rdb
 
 include($$PWD/../pymod.pri)
 

src/pymod/tl/tl.pro

@@ -1,5 +1,6 @@
 
-TARGET = tl
+TARGET = tlcore
+REALMODULE = tl
 
 include($$PWD/../pymod.pri)
 
@@ -41,3 +42,4 @@ msvc {
   init_target.extra = $(INSTALL_PROGRAM) $$DESTDIR_PYMOD/__init__.py $(INSTALLROOT)$$PREFIX/pymod/klayout
 }
 INSTALLS += init_target
+