'Determines whether the file is an amos assembly file format
Example::
{CTG
iid:1
eid:1
seq:
CCTCTCCTGTAGAGTTCAACCGA-GCCGGTAGAGTTTTATCA
qlt:
DDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDD
{TLE
src:1027
off:0
clr:618,0
gap:
250 612'

def sniff(self, filename):

    isAmos = False
    try:
        fh = open(filename)
        while (not isAmos):
            line = fh.readline()
            if (not line):
                break
            line = line.strip()
            if line:
                if line.startswith('{'):
                    if re.match('{(RED|CTG|TLE)$', line):
                        isAmos = True
        fh.close()
    except:
        pass
    return isAmos
