Made a step in removing knowledge of DatabaseWindow from QueryTab as an effort to move

in the direction of a plugin system.

DatabaseWindow now passes a Context to QueryTab and other pages that give those pages an
API for passing information up the system without knowing anything about the sytem.

pglab/pglab.pro

@@ -66,7 +66,6 @@ SOURCES += main.cpp\
     Module.cpp \
     EditorGutter.cpp \
     CodeEditor.cpp \
-    PlgPage.cpp \
 PropertyProxyModel.cpp \
     CodeGenerator.cpp \
     UserConfiguration.cpp \
@@ -84,7 +83,8 @@ PropertyProxyModel.cpp \
     SequenceModel.cpp \
     SequencesPage.cpp \
     DatabaseWindow.cpp \
-    PgLabTableView.cpp
+    PgLabTableView.cpp \
+    PluginContentWidget.cpp
 
 HEADERS  += \
     QueryResultModel.h \
@@ -126,7 +126,6 @@ HEADERS  += \
     Module.h \
     EditorGutter.h \
     CodeEditor.h \
-    PlgPage.h \
     AbstractCommand.h \
     PropertyProxyModel.h \
 CustomDataRole.h \
@@ -146,7 +145,9 @@ CustomDataRole.h \
     SequenceModel.h \
     SequencesPage.h \
     DatabaseWindow.h \
-    PgLabTableView.h
+    PgLabTableView.h \
+    PluginContentWidget.h \
+    IPluginContentWidgetContext.h
 
 FORMS    += mainwindow.ui \
 	ConnectionManagerWindow.ui \