Removed usage of 'popen' as it causes so many problems and reverted back to writing to temporary files when using the now very old PHP BibFormat
Removed usage of 'popen' as it causes so many problems and reverted back to writing to temporary files when using the now very old PHP BibFormat

tiborsimko/invenio-formatter,inveniosoftware/invenio-formatter,inveniosoftware/invenio-formatter,inveniosoftware/invenio-formatter,tiborsimko/invenio-formatter,tiborsimko/invenio-formatter