[web2py] Add count in db.parse_as_rest output

[Joseph.Piron]

Hi guys! 

I am using the wonderful db.parse_as_rest function in my development and 
like to ask if it is possible to push a modification in the trunk as as to 
be able to go on without custom code maintenance :)
For paging purposes, I would need the output of this function to contain 
the total number of records returned by the request (before limits 
applies). Fortunately, this is already computed by the function:
if i==len(tags) and table:
                    ofields = vars.get('order',db[table]._id.name).split('|'
)
                    try:
                        orderby = [db[table][f] if not f.startswith('~') 
else ~db[table][f[1:]] for f in ofields]
                    except KeyError:
                        return Row({'status':400,'error':'invalid orderby',
'response':None})
                    fields = [field for field in db[table] if field.readable
]
                    count = dbset.count()
                    try:
                        offset = int(vars.get('offset',None) or 0)
                        limits = (offset,int(vars.get('limit',None) or 1000
)+offset)
                    except ValueError:
                        Row({'status':400,'error':'invalid limits',
'response':None})
                    if count > limits[1]-limits[0]:
                        Row({'status':400,'error':'too many records',
'response':None})
                    try:
                        response = dbset.select(limitby=limits,orderby=
orderby,*fields)
                    except ValueError:
                        return Row({'status':400,'pattern':pattern,
                                    'error':'invalid path','response':None})
                    return Row({'status':200,'response':response,'pattern':
pattern})



and so I would modify the last return to:

                    return Row({'status':200,'response':response,'pattern':
pattern,'count':count})

Would this be acceptable ?

Thanks in advance !!