[rset] add convenient first() and last() methods on ResultSet
These make life easier for the heavy user of the CW shell.
Also aliases entities() with all(); so we end with a pretty consistant set:
- .one()
- .first()
- .last()
- .all()
@echo off
rem = """-*-Python-*- script
rem -------------------- DOS section --------------------
rem You could set PYTHONPATH or TK environment variables here
python -x "%~f0" %*
goto exit
"""
# -------------------- Python section --------------------
import sys
from os.path import join, dirname, normpath
sys.path.insert(0, normpath(join(dirname(__file__), '..', '..')))
from cubicweb.cwctl import run
run(sys.argv[1:])
DosExitLabel = """
:exit
rem """