buffered IO vs stream IO

[ChristinaXu2017]

Is your feature request related to a problem? Please describe.
The qio is a collection of File reader/writer for our internal files, such as GFF, VCF, MAF etc. Some use buffered IO but some use stream, the read() or flush() method in the stream is a heavy operation, buffered IO will be much faster to process our internal files.

Describe the solution you'd like
create a generic buffered reader/writer to process our tab-delimited files, such as GFF, VCF, germlineDB, gff3, Illumina, dbSnp, pileup file, etc.

Describe alternatives you've considered
this generic IO class is only for the text file including gzip file. Other format files, such as BAM, XML, should use other method.