split1() : it splits a Mark-Likhati text into a Mark-Likhati lower character list, to make easier single or double character transliteration}
example: split1("Bhria") gives ["bh", "ri", "a"] করা হয়েছে
convb(): it converts a Mark-Likhati lower character list into a Bengali rough character list using table object (no merging of vowels/conjunct) করা হয়েছে
mergeb(): applies Bengali character merging (vowels/conjuncts) to a Bengali rough character list and converts the list into a Bengali text করা হয়েছে
testTrans(): debugging routine, it runs the whole "pipe" of the three previous routines, as a shortcut of mergeb(convb(split1("Mark-Likhati string"))). করা হয়েছে