Here is what Ibn Kathir (one of the most respected Islamic commentators of all time) says about these verses:
"190. And fight in the way of Allah those who fight you, but transgress not the limits. Truly, Allah likes not the transgressors.) (191. And kill them wherever you find them, and turn them out from where they have turned you out. And Al-Fitnah is worse than killing. And fight not with them at Al-Masjid Al-Haram (the sanctuary at Makkah), unless they (first) fight you there. But if they attack you, then kill them. Such is the recompense of the
disbelievers. ) (192. But if they cease, then Allah is Oft-Forgiving, Most Merciful.) (193.
And fight them until there is no more Fitnah (disbelief and worshipping of others along with Allah) and the religion (all and every kind of worship) is for Allah (Alone). But if they cease, let there be no transgression except
against Az-Zalimin (the polytheists and wrongdoers)."
It seems that Ibn Kathir also thinks that the Az-Zalimin are the polytheists. Perhaps he couldn't speak Arabic?
Ibn Kathir then says:
"Allah said: (but transgress not the limits. Truly, Allah likes not the transgressors.) This Ayah means, `Fight for the sake of Allah and do not be transgressors,' such as, by committing prohibitions. Al-Hasan Al-Basri stated that transgression (indicated by the Ayah), "includes mutilating the dead, theft (from the captured goods), killing women, children and old people who do not participate in warfare, killing priests and residents of houses of worship, burning down trees and killing animals without real benefit.''
http://www.qtafsir.com/index.php?option=com_content&task=view&id=234
Another famous commentator, al-Jalalayn, says:
"
And slay them wherever you come upon them, and expel them from where they expelled you, that is, from Mecca, and this was done after the Conquest of Mecca; sedition,
their idolatry, is more grievous, more serious, than slaying, them in the Sacred Enclosure or while in a state of pilgrimage inviolability, the thing that you greatly feared. But fight them not by the Sacred Mosque, that is, in the Sacred Enclosure, until they should fight you there; then if they fight you, there, slay them, there (a variant reading drops the alif in the three verbs [sc. wa-lā taqtilūhum, hattā yaqtulūkum, fa-in qatalūkum, so that the sense is ‘slaying’ in all three, and not just ‘fighting’]) — such,
killing and expulsion, is the requital of disbelievers."
http://www.altafsir.com/Tafasir.asp...o=191&tDisplay=yes&UserProfile=0&LanguageId=2
Ibn ‘Abbâs, another famous commentator says:
"(And slay them) if they start the fight against you (wherever ye find them) whether in the Sacred Precinct or in other places, (and drive them) out of Mecca (out of the places whence they drove you out) as they drove you out of it, (for persecution)
associating partners with Allah and worshipping idols (is worse) more evil (than slaughter) in the Sacred Precinct. (And fight not with them) do not initiate a fight with them (at the Inviolable Place of Worship) in the Sacred Precinct (until they attack you there) until they initiate a fight with you in the Sacred Precinct, (but if they attack you (there)) first (then slay them.
Such is the reward of disbelievers) i.e. death is their reward."
http://www.altafsir.com/Tafasir.asp...o=191&tDisplay=yes&UserProfile=0&LanguageId=2
Al-Jalalayn adds:
"
Fight them till there is no sedition, no idolatry, and the religion, all worship, is for God, alone and none are worshipped apart from Him; then if they desist, from idolatry, do not aggress against them. This is indicated by the following words, there shall be no enmity, no aggression through slaying or otherwise, save against evildoers. Those that desist, however, are not evildoers and should not be shown any enmity."