Makefile: Add target `install`.
This makes distribution packagers live even easier.
include yslt.yml2
tstylesheet {
template "/list/*"
| INSERT INTO «name()» (`apply "*", 0, mode="names"`) VALUES (`apply "*", mode="values"`);
template "*", mode="names" > «name()»`if "position()!=last()" ", "`
template "*", mode="values" > '«.»'`if "position()!=last()" ", "`
}