Deprecate export to KML files

Related to #3983, see discussion there for the rationale.

INSTALL-MAC

@@ -30,7 +30,6 @@ CONTENTS
 2. ADDING OPTIONAL DEPENDENCIES
    - FTDI D2XX
    - SRMIO
-   - libkml
    - libusb
    - libical
 
@@ -251,7 +250,6 @@ $ open src/GoldenCheetah.app
 ===============================
 
    - SRMIO
-   - libkml
    - libusb
    - libical
 
@@ -266,19 +264,7 @@ should be taken into account.
 SRMIO (git)
 ./configure CFLAGS="-isysroot /Developer/SDKs/MacOSX10.7.sdk -arch x86_64" CPPFLAGS=-I/usr/local/D2XX/ --disable-dependency-tracking
 
-2.2 libkml - For export to Google Earth
----------------------------------------
-
-expat (2.0.1)
-./configure CFLAGS="-isysroot /Developer/SDKs/MacOSX10.7.sdk -arch x86_64" --disable-dependency-tracking 
-
-libkml (pulled down from the svn repo)
-
-./configure CFLAGS="-isysroot /Developer/SDKs/MacOSX10.7.sdk -arch x86_64" --disable-dependency-tracking --with-expat-include-dir=/usr/local/include --with-expat-lib-dir=/usr/local/lib --disable-swig CXXFLAGS="-isysroot /Developer/SDKs/MacOSX10.7.sdk -arch x86_64"
-
-note: the added CXXFLAGS helped clear the -Werror flag that stopped compilation.
-
-2.3 libusb - For Garmin USB2 stick support
+2.2 libusb - For Garmin USB2 stick support
 ------------------------------------------
 
 libusb (0.1.12)
@@ -295,7 +281,7 @@ make install
 
 note: that the sed line updates some commands in libtool.  not sure why the arch clags are not getting passed.  
 
-2.4 libical
+2.3 libical
 -----------
 
 libical (0.46)