Log Message:
Update to version 1.4.3.

Also replace "python" with real path to python in more files.
NOTE: this is not complete a few more files still have "python"
hard-coded.

The release notes says: "This is a bug fix release that improves
stability and MS Windows support. Notable new features include:
* The windows port does not need a MSys (unix-like tools) installation
anymore.  * A new function inset-dissolve has been added to delete
an text inset and put its contents in the enclosing text; this can
be accessed (like in the math editor) by pressing Backspace at the
start of an inset, or Delete at the end.  * Many crashes have been
fixed, in particular for systems based on gcc 4.1.  All current
1.4.x users are encouraged to upgrade to this version."