Fixed geany extrasel and insertnum Installation instructions

Clarified geany extrasel scintilla issues a bit

geanyextrasel/README

@@ -29,17 +29,8 @@ Geany 0.19 or later and the respective headers and development libraries.
 
 Installation
 ------------
-Compiling and installing the code is done by the following three
-commands:
-
-$ ./waf configure
-$ ./waf build
-$ ./waf install
-
-For more configuration details run
-$ ./waf --help
-
-If there are any errors during compilation, check your build environment.
+This plugin is part of the geany-plugins project.
+See the README file of that package.
 
 
 Usage
@@ -94,13 +85,15 @@ Alt-Shift-F12. Now:
 
 Known issues
 ------------
-If the cursor is on a large line number, converting a stream selection to
-rectangular may cause a noticable delay. This is scintilla-related; with
-the newest scintilla versions (r3465+), the delay is much smaller.
+Rectangular selection of more than a few thousand lines is slow, so you
+may prefer to use stream selection and convert it to rectangular. However,
+if the cursor is on a large line number, such conversion may cause a
+noticable delay. Both issues are scintilla related and can not be fixed by
+this plugin.
 
 If you set the anchor beyond a line end (in the "virtual space"), and edit
-the text before it, the anchor will be moved to the line end. Not a big
-issue, and tracking a virtual position is impossible in scintilla.
+the text before it, the anchor will be moved to the line end. Tracking a
+virtual (after EOLN) cursor position is impossible in scintilla.
 
 
 License

geanyinsertnum/README

@@ -16,17 +16,8 @@ Geany 0.19 or later and the respective headers and development libraries.
 
 Installation
 ------------
-Compiling and installing the code is done by the following three
-commands:
-
-$ ./waf configure
-$ ./waf build
-$ ./waf install
-
-For more configuration details run
-$ ./waf --help
-
-If there are any errors during compilation, check your build environment.
+This plugin is part of the geany-plugins project.
+See the README file of that package.
 
 
 Usage