fix dependencies in sfepy/terms/extmods/setup.py

- this fixes rebuilding terms.so even when an unrelated file was changed
rename & update script/gen_lobatto_pyx.py -> script/gen_lobatto1d_c.py

- generate lobatto1d.c and lobatto1h.c
- new lobatto1d_template.c, lobatto1d_template.h
split lobatto_template.pyx into lobatto_bases.pyx and lobatto.c

- low level functions in lobatto.c, as in lagrange.c
update sfepy/fem/extmods/setup.py
update import
update generated Lobatto basis files