Clamp the records to time range for text export

[rodarima]

Fixes: bsc-performance-tools/wxparaver#26

Before:

# obj	start	length	val
1.1.1	0.00	1010.00	0.00
1.1.1	1010.00	10.00	1.00
1.1.1	1020.00	10.00	2.00
1.1.1	1030.00	60.00	3.00
1.1.1	1090.00	910.00	5.00

After:

# obj	start	length	val
1.1.1	1000.00	10.00	0.00
1.1.1	1010.00	10.00	1.00
1.1.1	1020.00	10.00	2.00
1.1.1	1030.00	60.00	3.00
1.1.1	1090.00	10.00	5.00