Move help from Comment-based to md. Relocate functions (sans help)

ExportedCommands/Get-ExcelColumnName.ps1

@@ -0,0 +1,27 @@
+function Get-ExcelColumnName {
+    param(
+        [Parameter(ValueFromPipeline=$true)]
+        $columnNumber=1
+    )
+
+    Process {
+        $dividend = $columnNumber
+        $columnName = New-Object System.Collections.ArrayList($null)
+        
+        while($dividend -gt 0) {
+            $modulo      = ($dividend - 1) % 26
+            if ($columnName.length -eq 0) {
+                [char](65 + $modulo)
+            } else {
+                $columnName.insert(0,[char](65 + $modulo))
+            }
+            $dividend    = [int](($dividend -$modulo)/26)
+        }
+
+        [PSCustomObject] @{
+            ColumnNumber = $columnNumber
+            ColumnName   = $columnName -join ''
+        }
+
+    }
+}