Squashed commit of the following:

commit 631eef6e
Author: Deepankar Chakroborty <deepankar.chakroborty@utu.fi>
Date:   Wed Jul 29 14:41:00 2020 +0300

    Switch to stringi to improve performance.

commit 99a6589b
Author: Deepankar Chakroborty <deepankar.chakroborty@utu.fi>
Date:   Wed Jul 29 14:39:44 2020 +0300

    Include MutSiteFind.R and improved installing dependencies

    unparalogMutations checks & installs dependencies only when it is sourced, and not everytime the function was called (as previously).

commit a044ac9f
Author: Deepankar Chakroborty <deepankar.chakroborty@utu.fi>
Date:   Wed Jul 29 14:19:03 2020 +0300

    updated 20200714

commit cd79464c
Author: Deepankar Chakroborty <deepankar.chakroborty@utu.fi>
Date:   Wed Jul 29 13:12:47 2020 +0300

    Squashed commit of the following:

    commit 23f5db8f
    Author: Deepankar Chakroborty <deepankar.chakroborty@utu.fi>
    Date:   Wed Jul 29 13:12:26 2020 +0300

        Changed to Apache License 2.0

    commit 21ad1ee7
    Author: Deepankar Chakroborty <deepankar.chakroborty@utu.fi>
    Date:   Wed Jul 29 13:12:05 2020 +0300

        Update info section