New column page

Shows SQL for columns ALTER TABLE ... [ADD|DROP] COLUMN combines a selection
of multiple columns into a single alter table.
Show collation in list of columns.

(order of columns isn't what is should be but that should maybe be fixed
by a generic column selection and ordering mechanism that knows what the
default sort should be)

pglablib/pglablib.pro

@@ -71,7 +71,9 @@ codebuilder/StructureTemplate.cpp \
     PgDatabaseObject.cpp \
     PgServerObject.cpp \
     PgOwnedObject.cpp \
-    PgNamespaceObject.cpp
+    PgNamespaceObject.cpp \
+    PgCollation.cpp \
+    PgCollationContainer.cpp
 
 HEADERS += \
         Pglablib.h \
@@ -125,7 +127,9 @@ codebuilder/StructureTemplate.h \
     PgDatabaseObject.h \
     PgServerObject.h \
     PgOwnedObject.h \
-    PgNamespaceObject.h
+    PgNamespaceObject.h \
+    PgCollation.h \
+    PgCollationContainer.h
 
 unix {
     target.path = /usr/lib