add preprocessing routines flex_extract_ecgate_V6.0

preprocessing/flex_extract_ecgate_V6.0/CONTROL_ERA_TEMPLATE

preprocessing/flex_extract_ecgate_V6.0/CONTROL_ERA__CV

preprocessing/flex_extract_ecgate_V6.0/CONTROL_ERA__EI

...rocessing/flex_extract_ecgate_V6.0/CONTROL_ERA__GLOBALETA

...cessing/flex_extract_ecgate_V6.0/CONTROL_ERA__GLOBALGAUSS

preprocessing/flex_extract_ecgate_V6.0/CONTROL_ERA__HAIYAN

preprocessing/flex_extract_ecgate_V6.0/CONTROL_ERA__HIRES

preprocessing/flex_extract_ecgate_V6.0/CONTROL_OPS_TEMPLATE

preprocessing/flex_extract_ecgate_V6.0/CONTROL_OPS_V6.0

preprocessing/flex_extract_ecgate_V6.0/CONTROL_OPS_V6.0_4V

preprocessing/flex_extract_ecgate_V6.0/ecmwf_idc_ops_body

preprocessing/flex_extract_ecgate_V6.0/ecmwf_idc_ops_ecgate

preprocessing/flex_extract_ecgate_V6.0/ecmwf_idc_ops_header

...ng/flex_extract_ecgate_V6.0/ecmwf_idc_ops_header_template

...ssing/flex_extract_ecgate_V6.0/ecmwf_idc_ops_multi_ecgate

...ssing/flex_extract_ecgate_V6.0/ecmwf_idc_ops_multi_footer

...ssing/flex_extract_ecgate_V6.0/ecmwf_idc_ops_multi_header

...x_extract_ecgate_V6.0/ecmwf_idc_ops_multi_header_template

preprocessing/flex_extract_ecgate_V6.0/flex_ecmwf_CV

preprocessing/flex_extract_ecgate_V6.0/flex_ecmwf_EI