Fix some old version numbers in documents that have never been updated.

Doxygen/Doxyfile

@@ -31,7 +31,7 @@ PROJECT_NAME           = NXWidgets
 # This could be handy for archiving the generated documentation or
 # if some version control system is used.
 
-PROJECT_NUMBER         = "1.18"
+PROJECT_NUMBER         = "1.19"
 
 # The OUTPUT_DIRECTORY tag is used to specify the (relative or absolute)
 # base path where the generated documentation will be put.

ReleaseNotes.txt

@@ -490,14 +490,14 @@ NxWidgets-1.15
 ==============
 
 The 16th release of the NxWidgets package was made on April 14, 2015.  This
-release depends on NuttX-7.9 or above and should not be used with older
+release depends on NuttX-7.24 or above and should not be used with older
 NuttX releases.
 
 Additional new features and extended functionality in Version 1.15:
 
 * The primary purpose of this release is update the NxWidgets and NxWM
   implementations to reflect changes in naming and interfaces in the
-  NuttX 7.9 release
+  NuttX 7.24 release
 * NxWidgets:: INxWindow, CNxWindow, CBgWindow, CNxTkWindow, CNxToolbar,
   CGraphicsPort updated to include a "caps" parameter in all drawLine()
   methods.  This permits drawing a circular cap at the end of lines and

libnxwidgets/doc/mainpage.h

@@ -75,7 +75,7 @@
  *  many NSH sessions in windows as you want. (keybard input still comes
  *  through serial).
  *
- *  Note 1: The current release of NwWM requires NuttX-7.9 or above.
+ *  Note 1: The current release of NwWM requires NuttX-7.24 or above.
  *
  *  Note 2: Many of the fundamental classes in NxWidgets derive from the Antony
  *  Dzeryn's "Woopsi" project: http://woopsi.org/ which also has a BSD style