dhaka bangladesh opposition leader former prime minister khaleda zia return home wednesday rapturous welcome supporters three months away medical treatment britain bangladeshi politics mire years rivalry khaleda prime minister sheikh hasina khaleda return could herald increase political activity preparation general election due end next year women relate former national leaders alternate prime minister years khaleda absence least two arrest warrant issue connection political turbulence already bail several case lawyers dismiss case harassment spokesman bangladesh nationalist party bnp mohammad shamsuddin say might appear court thursday connection case mohammad shahidul huq inspector general police tell reporters instructions arrest hundreds party supporters wave placard banners gather outside international airport capital dhaka welcome home bangladesh struggle cope influx half million rohingya muslim refuges myanmar since late august crisis could become divisive issue run-up election return bangladesh opposition chief could herald active politics