opensc-explorer: use relative addressing in do_cat
opensc-explorer: use relative addressing in do_cat

'cat' takes a file_id as argument. This should be selected relative
to the currently selected DF instead of being treated as an ID.
(compare with 'get' that also takes a file_id argument)

See http://www.opensc-project.org/pipermail/opensc-devel/2011-March/016172.html

Signed-off-by: Peter Marschall <peter@adpm.de>

git-svn-id: 444ed946b9c2220da791e84c3dd156a05f92db99@5280 c6295689-39f2-0310-b995-f0e70906c6a9

ieugen/OpenSC,germanblanco/OpenSC,jpki/OpenSC,dirkx/OpenSC.tokend,aobaid/OpenSC,dirkx/OpenSC,CardContact/OpenSC,martinpaljak/OpenSC,UIKit0/OpenSC,Jakuje/OpenSC,hongquan/OpenSC-main,hhonkanen/OpenSC,dirkx/OpenSC.tokend,mtrojnar/OpenSC,dirkx/OpenSC,marschap/pkg-opensc,viktorTarasov/OpenSC-SM,fabled/OpenSC,ieugen/OpenSC,frankmorgner/OpenSC,mouse07410/OpenSC,financeX/OpenSC,gemini/OpenSC,marschap/pkg-opensc,dirkx/OpenSC,rickyepoderi/OpenSC,tidatida/OpenSC,dirkx/OpenSC.tokend,fabled/OpenSC,0x7678/myOpenSC,mouse07410/OpenSC,adminmt/OpenSC,frankmorgner/OpenSC,carlhoerberg/OpenSC,gentoo/OpenSC,velter/OpenSC,hongquan/OpenSC-main,carlhoerberg/OpenSC,AktivCo/OpenSC,financeX/OpenSC,financeX/OpenSC,aobaid/OpenSC,adminmt/OpenSC,dengert/OpenSC,marschap/pkg-opensc,dengert/OpenSC,CardContact/OpenSC,gentoo/OpenSC,tidatida/OpenSC,martinpaljak/OpenSC,dirkx/OpenSC.tokend,LudovicRousseau/OpenSC,viktorTarasov/OpenSC-SM,aobaid/OpenSC,ieugen/OpenSC,philipWendland/OpenSC,AktivCo/OpenSC,metsma/OpenSC,metsma/OpenSC,financeX/OpenSC,velter/OpenSC,ieugen/OpenSC,carlhoerberg/OpenSC,nmav/OpenSC,0x7678/OpenSC,fabled/OpenSC,jpki/OpenSC,gentoo/OpenSC,hhonkanen/OpenSC,rickyepoderi/OpenSC,Jakuje/OpenSC,OpenSC/OpenSC,frankmorgner/OpenSC,0x7678/OpenSC,kasparsd/opensc-latvia-id,gentoo/OpenSC,UIKit0/OpenSC,martinpaljak/OpenSC,mouse07410/OpenSC,kasparsd/opensc-latvia-id,CardContact/OpenSC,germanblanco/OpenSC,UIKit0/OpenSC,velter/OpenSC,ieugen/OpenSC,0x7678/myOpenSC,adminmt/OpenSC,0x7678/OpenSC,tidatida/OpenSC,gemini/OpenSC,OpenSC/OpenSC,philipWendland/OpenSC,velter/OpenSC,0x7678/myOpenSC,l1k/OpenSC,dirkx/OpenSC,gentoo/OpenSC,gemini/OpenSC,mtrojnar/OpenSC,Jakuje/OpenSC,LudovicRousseau/OpenSC,viktorTarasov/OpenSC-SM,financeX/OpenSC,marschap/pkg-opensc,nmav/OpenSC,jpki/OpenSC,rickyepoderi/OpenSC,fabled/OpenSC,0x7678/OpenSC,frankmorgner/OpenSC,0x7678/myOpenSC,metsma/OpenSC,hhonkanen/OpenSC,0x7678/myOpenSC,carlhoerberg/OpenSC,hongquan/OpenSC-main,OpenSC/OpenSC,dirkx/OpenSC.tokend,kasparsd/opensc-latvia-id,l1k/OpenSC,kasparsd/opensc-latvia-id,dirkx/OpenSC.tokend,tidatida/OpenSC,aobaid/OpenSC,dirkx/OpenSC,UIKit0/OpenSC,germanblanco/OpenSC,AktivCo/OpenSC,adminmt/OpenSC,mtrojnar/OpenSC,nmav/OpenSC,Jakuje/OpenSC,LudovicRousseau/OpenSC,l1k/OpenSC,philipWendland/OpenSC,carlhoerberg/OpenSC,dengert/OpenSC